There is only one bottle of the McDonald’s Big Mac special sauce up for auction on eBay and it is already up at $23,000.

According to Daily Mail Australia, there were 200 500ml bottles of the special sauce made and within two days, there were 135 bids from fans of Aussi Macca. The auction will be up until Feb. 11.

The ad on the site says the sauce will go great with anything, including ice cream and fish oil capsules. That might be an exaggeration. And all of the proceeds from the sale of the sauce will go to the Ronald McDonald House Charities.

Technically, the ingredients of the special sauce have never been a secret to consumers. What has never been revealed is the ratio that is put together in order to make the distinct flavor the sauce is known for.

The other 199 bottles of the sauce will not be up for sale.

BBC News reported the sale is only available for people in Australia. Sorry, America and other countries! Customers in Australia will also be able to go to any of the McDonald’s stores and purchase the sauce, which will be contained in 25ml tubs.

The ingredients in the sauce call for relish, onion, mustard, salted egg yolks, and garlic. Good luck figuring out the ratio for this scrumptious sauce, though.